a
硬件设计手册
SIM900A_HD_CN_V1.01
SIM900A 硬件设计手册
文档名称: SIM900A 硬件设计手册
版本: 1.01
日期: 2010-02-22
状态: 发布
文档控制号: SIM900A_HD_CN_V1.01
前言
感谢您使用 SIMCom 有限公司提供的 SIM900A 模块。本产品具有标准 AT 命令接口,可以提供 GSM 语
音、短消息等业务。使用前请务必仔细阅读此用户手册,您将领略其完善强大的功能和简洁的操作方法。
本设备主要用于语音或者数据通信,本公司不承担由于客户不正常操作造成的财产或者人身伤害责任。
请客户按照手册中的技术规格和参考设计开发相应的产品。同时注意使用移动产品特别是 GSM 产品应该
关注的一般安全事项。
在未声明之前,本公司有权根据技术发展的需要对本手册内容进行更改
本手册版权属于SIMCom有限公司,任何人未经我公司书面同意复制将承担法律责任。
版权声明
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SIM900A 硬件设计手册
目录
目录............................................................................................................................................................................3
版本历史....................................................................................................................................................................7
1 绪论........................................................................................................................................................................8
1.1 相关文档.....................................................................................................................................................8
1.2 术语和解释..................................................................................................................................................9
1.3 安全警告...................................................................................................................................................11
2 SIM900A综述........................................................................................................................................................12
2.1 SIM900A主要特性.....................................................................................................................................12
2.2 SIM900A 功能图.......................................................................................................................................14
2.3 SIM900A 评估板.......................................................................................................................................15
3 应用接口..............................................................................................................................................................16
3.1 SIM900A 引脚描述...................................................................................................................................16
3.2 工作模式....................................................................................................................................................19
3.3 供电............................................................................................................................................................20
3.3.1 供电引脚..........................................................................................................................................21
3.3.2 最小功耗..........................................................................................................................................21
3.3.3 供电监测..........................................................................................................................................21
3.4 开机关机....................................................................................................................................................21
3.4.1 SIM900A开机...................................................................................................................................21
3.4.2 SIM900A关机...................................................................................................................................24
3.4.3 SIM900A重新启动 ...........................................................................................................................27
3.5 省电............................................................................................................................................................27
3.5.1 最小功能模式 ..................................................................................................................................27
3.5.2 SLEEP模式(慢时钟模式) ...........................................................................................................27
3.5.3 从SLEEP模式唤醒模块 ..................................................................................................................28
3.6 状态转换图(不包含SLEEP模式) .........................................................................................................28
3.7 RTC电源 .....................................................................................................................................................28
3.8 串口............................................................................................................................................................30
3.8.1 串口和调试口功能 ..........................................................................................................................31
3.8.2 软件调试和升级 ..............................................................................................................................32
3.9 音频接口....................................................................................................................................................33
3.9.1 扬声器接口电路 ...............................................................................................................................34
3.9.2 麦克风接口电路 ..............................................................................................................................35
3.9.3 耳机接口电路 ..................................................................................................................................36
3.9.4 相关电气参数 ..................................................................................................................................36
3.10 SIM卡接口................................................................................................................................................37
3.10.1 SIM应用..........................................................................................................................................37
3.10.2 SIM 卡座的选择............................................................................................................................39
3.11 LCD显示接口...........................................................................................................................................41
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3.12 键盘接口..................................................................................................................................................41
3.13 模数转换器(ADC) ..............................................................................................................................42
3.14 RI信号线动作...........................................................................................................................................43
3.15 网络状态指示灯......................................................................................................................................44
3.16 通用输入输出(GPIO)..............................................................................................................................44
3.17 外部复位输入..........................................................................................................................................45
3.18 PWM .........................................................................................................................................................45
3.19 I2C总线.....................................................................................................................................................46
4 天线接口..............................................................................................................................................................46
4.1 模块射频输出功率....................................................................................................................................46
4.2 模射频接收灵敏度....................................................................................................................................47
4.3 模块工作频段............................................................................................................................................47
5 电气,可靠性和射频特性..................................................................................................................................47
5.1 绝对最大值................................................................................................................................................47
5.2 工作温度....................................................................................................................................................47
5.3 电源额定值................................................................................................................................................48
5.4 耗流............................................................................................................................................................49
5.5 静电放电....................................................................................................................................................49
6 机械尺寸..............................................................................................................................................................50
6.1 SIM900A的机械尺寸.................................................................................................................................50
6.2 SIM900A的顶视图和底视图.....................................................................................................................52
6.3 SIM900A引脚分配.....................................................................................................................................53
6.4 SIM900A推荐焊接炉温曲线图.................................................................................................................55
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表格索引
表 1: 相关文档 ................................................................................................................................................................ 8
表 2: 术语和解释 ............................................................................................................................................................ 9
表 3: SIM900A主要特性 ................................................................................................................................................ 12
表 4:编码格式和耦合时最大网络数据速度率 .......................................................................................................... 14
表 5:引脚描述 .............................................................................................................................................................. 16
表 6: 工作模式............................................................................................................................................................... 19
表 7:串口引脚定义 ...................................................................................................................................................... 30
表 8: 串口的逻辑电平................................................................................................................................................... 31
表 9:音频接口引脚定义 .............................................................................................................................................. 33
表 10:音频输入参数 .................................................................................................................................................... 36
图 11:音频输出参数 .................................................................................................................................................... 37
表 12:SIM卡接口引脚定义 ......................................................................................................................................... 37
表 13: 引脚描述(AMPHENOL SIM卡座) .................................................................................................................... 39
表 14:引脚描述 (MOLEX SIM卡座) ......................................................................................................................... 40
表 15:LCD接口引脚定义 ............................................................................................................................................ 41
表 16:键盘接口引脚信号定义 .................................................................................................................................... 41
表 17:ADC参数............................................................................................................................................................ 43
表 18:RI信号线动作 .................................................................................................................................................... 43
表 19:NETLIGHT工作状态 ........................................................................................................................................ 44
表 20:GPIO接口引脚定义........................................................................................................................................... 45
表 21:PWM引脚定义................................................................................................................................................... 45
表 22:I2C总线接口信号定义 ...................................................................................................................................... 46
表 23: SIM900A 传导射频输出功率 ............................................................................................................................ 46
表 24: SIM900A 传导射频接收灵敏度 ........................................................................................................................ 47
表 25: SIM900A 工作频段 ............................................................................................................................................ 47
表 26:绝对最大值 ........................................................................................................................................................ 47
表 27:SIM900A工作温度 ............................................................................................................................................ 47
表 28:SIM900A电源额度值 ........................................................................................................................................ 48
表 29: SIM900A耗流...................................................................................................................................................... 49
表 30:ESD 性能参数(温度:25℃,湿度:45%)................................................................................................ 49
表 31:引脚分配 ............................................................................................................................................................ 53
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图片索引
图 1:SIM900A 功能框图 ............................................................................................................................................ 14
图 2:SIM900A评估板顶视图 ...................................................................................................................................... 15
图 3:VBAT 输入参考电路.......................................................................................................................................... 20
图 4:供电输入参考设计电路 ...................................................................................................................................... 20
图 5:猝发时VBAT的跌落............................................................................................................................................ 21
图 6:SIM900A使用驱动电路开机 .............................................................................................................................. 22
图 7:SIM900A使用按键开机 ...................................................................................................................................... 22
图 8:使用PWRKEY开机时序图 ................................................................................................................................. 23
图 9:SIM900A使用驱动电路开机 .............................................................................................................................. 23
图 10:SIM900A使用按键开机 .................................................................................................................................... 24
图 11:使用PWRKEY 和PWRKEY_OUT 开机时序图............................................................................................. 24
图 12:使用PWRKEY引脚关机时序图........................................................................................................................ 25
图 13:使用PWRKEY和PWRKEY_OUT关机时序图................................................................................................. 25
图 14:系统重启时序图 ................................................................................................................................................ 27
图 15:状态转换图 ........................................................................................................................................................ 28
图 16:RTC采用不可充电电池供电............................................................................................................................. 29
图 17:RTC采用可充电电池供电................................................................................................................................. 29
图 18:RTC采用电容供电............................................................................................................................................. 29
图 19:SEIKO XH414H-IV01E 充电特性................................................................................................................... 30
图 20:串口连接图 ........................................................................................................................................................ 31
图 21:软件升级和调试接口 ........................................................................................................................................ 33
图 22:RS232 电平转换电路 ........................................................................................................................................ 33
图 23:扬声器接口电路 ................................................................................................................................................ 34
图 24:带音频放大器的音频接口电路 ........................................................................................................................ 35
图 25:麦克风接口电路 ................................................................................................................................................ 35
图 26:耳机接口电路 .................................................................................................................................................... 36
图 27:8 引脚卡座的接口推荐电路 ............................................................................................................................. 38
图 28:6 引脚卡座的接口推荐电路 ............................................................................................................................. 38
图 29:AMPHENOL C707 10M006 512 2 SIM卡座尺寸图 ........................................................................................ 39
图 30:MOLEX 91228 SIM卡座................................................................................................................................... 40
图 31:键盘接口参考电路 ............................................................................................................................................ 42
图 32:ADC结构图........................................................................................................................................................ 42
图 33:SIM900A作为被叫 ............................................................................................................................................. 43
图 34:SIM900A作为主叫 ............................................................................................................................................ 44
图 35:NETLIGHT参考设计电路................................................................................................................................. 44
图 36:复位时序图 ........................................................................................................................................................ 45
图 37:模块顶视图和侧视图的物理尺寸(单位:MM) ......................................................................................... 50
图 38:模块底视图的物理尺寸(单位:MM) ......................................................................................................... 51
图 39:推荐PCB封装图(单位:MM)...................................................................................................................... 51
图 40:SIM900A顶视和底视图 .................................................................................................................................... 52
图 41:SIM900A引脚图(顶视图) ............................................................................................................................ 53
图 42:SIM900A推荐焊接炉温曲线图 ........................................................................................................................ 55
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SIM900A 硬件设计手册
版本历史
日期
2010-02-22
版本
1.01
变更描述
初版
作者
李刚
SIM900_HD_V1.01 7 22.02.2010
SIM900A 硬件设计手册
1 绪论
本文档描述了SIM900A的硬件应用接口,包括相关应用场合的电路连接以及射频接口等。SIM900A的
应用十分广泛,本文档将详细介绍SIM900A的所有功能。
本文档可以帮助用户快速的了解SIM900A的接口定义、电器性能和结构尺寸的详细信息。结合本文档
和其他的SIM900A的应用文档,用户可以快速的使用SIM900A来设计移动应用方案。
1.1 相关文档
表 1: 相关文档
序号 文档名称
[1]
SIM900_ATC
注释
SIM900_ATC
Serial asynchronous automatic dialing and control
Digital cellular telecommunications (Phase 2+); AT command set for GSM
Mobile Equipment (ME)
Support GSM 07.10 multiplexing protocol
Digital cellular telecommunications (Phase 2+); Use of Data Terminal
Equipment – Data Circuit terminating Equipment (DTE – DCE) interface for
Short Message Service (SMS) and Cell Broadcast Service (CBS)
Digital cellular telecommunications system (Phase 2+); Specification of the SIM
Application Toolkit for the Subscriber Identity Module – Mobile Equipment
(SIM – ME) interface
Digital cellular telecommunications system (Phase 2+); Specification of the
Subscriber Identity Module – Mobile Equipment (SIM – ME) interface
Digital cellular
language-specific information
Digital cellular telecommunications system (Phase 2); Mobile Station (MS)
conformance specification; Part 1: Conformance specification
AN_Serial Port
telecommunications system (Phase 2+); Alphabets and
[2]
[3]
[4]
[5]
ITU-T Draft new
recommendation
V.25ter:
GSM 07.07:
GSM 07.10:
GSM 07.05:
[6]
GSM 11.14:
[7]
GSM 11.11:
[8]
GSM 03.38:
[9]
GSM 11.10
[10]
AN_Serial Port
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